No default toolchain configured after installing rustup

Solution 1:

If it seems that rustup did not successfully install and configure the stable toolchain, you can do it manually:

rustup install stable
rustup default stable

After testing, it seems like my incomplete installation may have been caused by a network error. You can also try to reinstall to solve the problem.

Solution 2:

The problem is due to my connection and my proxy which didn't allow rustc, cargo, and others to be downloaded.

I thought that the all the executables were all-in-one but apparently not.

Solution 3:

In my case, I had multirust installed and the following worked for me:

multirust install stable
multirust default stable

Solution 4:

I installed rust by root,but my IDEA works on user,then I installed rust on user,all worked well.